DocumentCode :
771763
Title :
Retrieving quality video across heterogeneous networks. Video over wireless
Author :
Moura, Jose M F ; Jasinschi, Radu S. ; Shiojiri, Hirohisa ; Lin, Jyh-Cherng
Author_Institution :
Dept. de Engenharia Electrotecnica e de Comput., Inst. Superior Tecnico, Lisbon, Portugal
Volume :
3
Issue :
1
fYear :
1996
fDate :
2/1/1996 12:00:00 AM
Firstpage :
44
Lastpage :
54
Abstract :
The article addresses the issues that arise in delivering video across Wireless Andrew. Wireless Andrew is the Carnegie Mellon University (CMU) heterogeneous networking environment. It interconnects wideband and narrowband wireless and wired networks using off-the-shelf technologies. The authors design a video system where video servers distributed across the network deliver, upon request, video clips to clients scattered around the campus. The main novelty of the article is generative video (GV), a content-based meta representation for video that is well suited for the heterogeneous dynamic environment of Wireless Andrew. GV provides a framework for graceful degradation as end-to-end network throughput varies. GV reduces the video sequence to a small set of still images and side information needed to reconstruct the original sequence. The authors have demonstrated for three real live video sequences that GV delivers compression ratios in the range of 1000-10000 with good perceptual quality They develop a scalable implementation for the GV coder/decoder (codec). Scalability coding avoids duplicating the encoding of each video clip when servicing a wide range of throughputs, as in heterogeneous networks. They discuss the video delivery requirements, the video system architecture, the system implementation, and the trade-offs needed to ensure graceful degradation under real-life network operating conditions
Keywords :
data compression; image representation; image sequences; interactive video; land mobile radio; packet radio networks; video coding; visual communication; wide area networks; wireless LAN; Carnegie Mellon University heterogeneous networking environment; Wireless Andrew; codec; compression ratios; content-based meta representation; degradation; end-to-end network throughput; generative video; heterogeneous network; heterogeneous networks; perceptual quality; scalability coding; still images; system implementation; video clip; video clips; video delivery requirements; video sequence; video servers; video system; video system architecture; Degradation; Image coding; Image reconstruction; Narrowband; Network servers; Scattering; Throughput; Video compression; Video sequences; Wideband;
fLanguage :
English
Journal_Title :
Personal Communications, IEEE
Publisher :
ieee
ISSN :
1070-9916
Type :
jour
DOI :
10.1109/98.486975
Filename :
486975
Link To Document :
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